Class antagonism applies in both cases, and when we have a means to benefit as a class, we should leverage it to the hilt. This dude seems to have several extra properties, but if it was just the one, then congratulations to him, he gets to be a prole like the rest of us and receive that level of consideration. Perhaps he should have asked the renter why they were in the situation they were in first.

As long as the landlord chooses to obstruct progress, he has made his bed and he can lie in it. We should not systemically discriminate against people with dementia, but not using a concrete practical advantage that you have over someone in terms of functional competence, whether the senile, confused codger is a landlord or the President, is bullshit moralism. If someone is on a crutch and threatening someone else with a weapon, you can be damn sure that I'm kicking it out from under them unless they can be talked down. That such an action could be confused by fools for ableism is of no interest to the person being threatened.

We have no choice but to live in brutal capitalism, and we must brutally use it or else abstain all the way to the grave knowing that we failed to improve the world but at least were able to save the very people fucking us over from getting hurt by the consequences of their own fucking actions.